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Vulnerability record · CVE-2019-18282 · published 16 January 2020

CVE-2019-18282: Linux kernel vulnerability

Linux · Linux Kernel

The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. This affects net/core/flow_dissector.c and related code.

5.3 CVSS 3.1 Medium EPSS 2.6% · top 15.1% CWE-330 · CWE-330
5.3CVSS 3.1 base score, v2 5.0
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. This affects net/core/flow_dissector.c and related code.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10 Mailing ListVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=55667441c84fa5e0911a0aac44fb059c15ba6da2 Mailing ListPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20200204-0002/ Third Party Advisory
https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10 Mailing ListVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=55667441c84fa5e0911a0aac44fb059c15ba6da2 Mailing ListPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20200204-0002/ Third Party Advisory
https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-18282), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.